would I need to harvest first in order to do that?

Yes.

Is that a cost efficient way to get "BNB" to pay the fees since I don't have a Binance account?

Once you are on BSC, you practically don't need a binance account. Yes, selling CUB is a way to cover for BNB fees.

Here you should consider these factors:

1. You can optimize BNB fees by doing fewer operations.
2. You can try to sell CUB "high", to get more out of it.

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